Method of producting thin sheet of high Si-Fe alloy

Abstract

PCT No. PCT/JP85/00534 Sec. 371 Date Feb. 10, 1986 Sec. 102(e) Date Feb. 10, 1986 PCT Filed Sep. 26, 1985 PCT Pub. No. WO86/02102 PCT Pub. Date Apr. 10, 1986.Fe alloy containing Si more than 4.0 wt % is produced by a thin plate casting process. The producing condition depends upon rapid solidification of Fe alloy from a molten condition at cooling rate of more than 1 DEG C./sen to less than 105 DEG C./sec. The obtained thin cast plates are subjected to a hot rolling of more than 30% at the temperature range of 600 DEG to 800 DEG C., and to the cold rolling to a determined thickness, followed pickling. By the above mentioned conditions, operations of the industrial scale may be practiced without cracks on the surface in the cold rolling excellent magnetic characteristics may be provided by passing the annealing after the cold rolling.

What is claimed is: 
     
       1. A method of producing thin sheets of Si-Fe alloy, comprising the steps of preparing molten Si-Fe alloy composition containing more than 4.0 weight percent Silicon;   casting the molten Si-Fe alloy to form plates of thickness ranging from 0.1 mm to 30 mm and cooling at a cooling rate of 1° C./sec to less than 10 5  ° C./sec, said casting being by thin plate casting;   subsequently hot rolling the cast plates at a reduction rate of more than 30 percent and at a temperature of between 600° C. and 800° C.; and   subsequently pickling, cold rolling and annealing.   
     
     
       2. A method as claimed in claim 1, wherein Fe alloy contains Si 4.0 to 7.0 wt%. 
     
     
       3. A method as claimed in claim 1, wherein Fe alloy contains Si 8.0 to 10.0 wt% and Al 4.0 to 7.0 wt%. 
     
     
       4. A method as claimed in claim 1, wherein Fe alloy contains Si 4.0 to 8.0 wt%, Al 2.0 to 6.0 wt% and Ni 1.0 to 5.0 wt%. 
     
     
       5. The method of claim 1, wherein the plates are first cast and cooled, then the temperature is made to be between 600° C. and 800° C., and then the plates are subjected to hot rolling at a reduction rate of more than 30 percent. 
     
     
       6. The method of claim 1, wherein the plates are first cast and subjected to cooling, and the hot rolling is undertaken during the time the temperature is between 600° C. and 800° C. during the cooling to 600° C., and with a reduction rate of more than 30 percent. 
     
     
       7. The method of claim 1 wherein said casting is by a thin plate casting process utilizing twin roller process. 
     
     
       8. The method of claim 1, wherein said casting is by a thin plate casting process utilizing a melt spinning process. 
     
     
       9. The method of claim 1, wherein said casting is by a thin plate casting process utilizing a spray casting process. 
     
     
       10. The method of claim 1, wherein said casting is by a thin plate casting process utilizing a hazellette process.